GE
Data Sheet
September 25, 2015 ©2015 General Electric Company. All rights reserved.
Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Module
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
Features
Compliant to RoHS EU Directive 2011/65/EU (-Z
versions)
Compliant to RoHS EU Directive 2011/65/EU under
exemption 7b (Lead solder exemption). Exemption 7b
will expire after June 1, 2016 at which time this
product will no longer be RoHS compliant (non-Z
versions)
Delivers up to 5A output current
High efficiency – 94% at 3.3V full load (VIN = 5.0V)
Small size and low profile:
20.3 mm x 11.4 mm x 5.97 mm
(0.80 in x 0.45 in x 0.235 in)
Low output ripple and noise
High Reliability:
Calculated MTBF = 19M hours at 25oC Full-load
Constant switching frequency (300 kHz)
Output voltage programmable from 0.75 Vdc to
4.0Vdc via external resistor
Line Regulation: 0.3% (typical)
Load Regulation: 0.4% (typical)
Temperature Regulation: 0.4 % (typical)
Remote On/Off
Output overcurrent protection (non-latching)
Wide operating temperature range (-40°C to 85°C)
UL* 60950-1Recognized, CSA† C22.2 No. 60950-1-03
Certified, and VDE‡ 0805:2001-12 (EN60950-1)
Licensed
ISO** 9001 and ISO 14001 certified manufacturing
facilities
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
Description
The Austin MicroLynxTM SMT (surface mount technology) power modules are non-isolated dc-dc converters that can deliver up to
5A of output current with full load efficiency of 94.0% at 3.3V output. These modules provide a precisely regulated output voltage
programmable via an external resistor from 0.75Vdc to 4.0Vdc over a wide range of input voltage (VIN = 3.0 – 5.8Vdc). Their open-
frame construction and small footprint enable designers to develop cost- and space-efficient solutions. Standard features include
remote On/Off, programmable output voltage, overcurrent and overtemperature protection.
* UL is a registered trademark of Underwriters Laboratories, Inc.
† CSA is a registered trademark of Canadian Standards Association.
‡ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
** ISO is a registered trademark of the International Organization of Standards
RoHS Compliant
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 2
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings
only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations
sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability.
Parameter Device Symbol Min Max Unit
Input Voltage All VIN -0.3 5.8 Vdc
Continuous
Operating Ambient Temperature All TA -40 85 °C
(see Thermal Considerations section)
Storage Temperature All Tstg -55 125 °C
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage VO,set ≤ VIN – 0.5V VIN 3.0 5.8 Vdc
Maximum Input Current All IIN,max 5.0 Adc
(VIN= VIN, min to VIN, max, IO=IO, max VO,set = 3.3Vdc)
Input No Load Current VO,set = 0.75 Vdc IIN,No load 20 mA
(VIN = 5.0Vdc, IO = 0, module enabled) VO,set = 3.3Vdc IIN,No load 45 mA
Input Stand-by Current All IIN,stand-by 0.6 mA
(VIN = 5.0Vdc, module disabled)
Inrush Transient All I2t 0.04 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; VIN, min to VIN,
max, IO= IOmax ; See Test configuration section)
All 35 mAp-p
Input Ripple Rejection (120Hz) All 30 dB
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to being part of a
complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety
and system protection, always use an input line fuse. The safety agencies require a fast-acting fuse with a maximum rating of 6 A
(see Safety Considerations section). Based on the information provided in this data sheet on inrush energy and maximum dc input
current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data sheet for further information.
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point All VO, set –2.0 +2.0 % VO, set
(VIN=IN, min, IO=IO, max, TA=25°C)
Output Voltage All VO, set –3% +3% % VO, set
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Adjustment Range All VO 0.7525 4.0 Vdc
Output Regulation
Line (VIN=VIN, min to VIN, max) All 0.3 % VO, set
Load (IO=IO, min to IO, max) All 0.4 % VO, set
Temperature (Tref=TA, min to TA, max) All 0.4 % VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max
Cout = 1μF ceramic//10μFtantalum capacitors)
RMS (5Hz to 20MHz bandwidth) All 10 15 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth) All 40 50 mVpk-pk
External Capacitance
ESR ≥ 1 mΩ All CO, max 1000 μF
ESR ≥ 10 mΩ All CO, max 3000 μF
Output Current All Io 0 5 Adc
Output Current Limit Inception (Hiccup Mode ) All IO, lim 220 % Io
Output Short-Circuit Current All IO, s/c 2 Adc
(VO≤250mV) ( Hiccup Mode )
Efficiency VO,set = 0.75Vdc η 79.0 %
VIN= VIN, nom, TA=25°C VO, set = 1.2Vdc η 85.0 %
IO=IO, max , VO= VO,set VO,set = 1.5Vdc η 87.0 %
VO,set = 1.8Vdc η 88.5 %
VO,set = 2.5Vdc η 92.0 %
VO,set = 3.3Vdc η 94.0 %
VO,set = 4.0Vdc η 95.0 %
Switching Frequency All fsw 300 kHz
Dynamic Load Response
(dIo/dt=2.5A/µs; VIN = VIN, nom; TA=25°C) All Vpk 130 mV
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts 25 µs
(dIo/dt=2.5A/µs; VIN = VIN, nom; TA=25°C) All Vpk 130 mV
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts 25 µs
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 4
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Dynamic Load Response
(dIo/dt=2.5A/µs; V VIN = VIN, nom; TA=25°C) All Vpk 50 mV
Load Change from Io= 50% to 100% of Io,max;
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts 50 µs
(dIo/dt=2.5A/µs; VIN = VIN, nom; TA=25°C) All Vpk 50 mV
Load Change from Io= 100% to 50%of Io,max:
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts 50 µs
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (IO=IO, max, TA=25°C) 19, 000,000 Hours
Weight 2.8 (0.1) g (oz.)
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 5
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See
Feature Descriptions for additional information.
Parameter Device Symbol Min Typ Max Unit
Remote On/Off Signal interface
(VIN=VIN, min to VIN, max; Open collector pnp or equivalent
Compatible, Von/off signal referenced to GND
See feature description section)
Logic Low (On/Off Voltage pin open - Module ON)
Von/Off All VIL ― ― 0.4 V
Ion/Off All IIL ― ― 10 μA
Logic High (Von/Off > 2.5V – Module Off)
Von/Off All VIH ― ― VIN V
Ion/off All IIH ― ― 1 mA
Turn-On Delay and Rise Times
(IO=IO, max , VIN = VIN, nom, TA = 25 oC, )
Case 1: On/Off input is set to Logic Low (Module
ON) and then input power is applied (delay from
instant at which VIN =VIN, min until Vo=10% of Vo,set)
All
Tdelay
3.9
msec
Case 2: Input power is applied for at least one second
and then the On/Off input is set to logic Low (delay from
instant at which Von/Off=0.3V until Vo=10% of Vo, set)
All
Tdelay
3.9
msec
Output voltage Rise time (time for Vo to rise from 10%
of Vo,set to 90% of Vo, set)
All
Trise
―
4.2
8.5
msec
Output voltage overshoot – Startup ―
1
% VO, set
IO= IO, max; VIN = 3.0 to 5.8Vdc, TA = 25 oC
Overtemperature Protection
All Tref 150 °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All 2.2 V
Turn-off Threshold All 2.0 V
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 6
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM SMT modules at 25ºC.
EFFICIENCY, η (%)
70
73
76
79
82
85
88
0 1 2 3 4 5
Vin = 5.5V
Vin = 5.0V
Vin = 3.0V
EFFICIENCY, η (%)
70
75
80
85
90
95
0 1 2 3 4 5
Vin = 5.5V
Vin = 5.0V
Vin = 3.0V
OUTPUT CURRENT, I
O
(A)
OUTPUT CURRENT, I
O
(A)
Figure 1. Converter Efficiency versus Output Current (Vout =
0.75Vdc).
Figure 4. Converter Efficiency versus Output Current (Vout =
1.8Vdc).
EFFICIENCY, η (%)
70
75
80
85
90
95
0 1 2 3 4 5
Vin = 5.5V
Vin = 5.0V
Vin = 3.0V
EFFICIENCY, η (%)
70
75
80
85
90
95
100
0 1 2 3 4 5
Vin = 5.5V
Vin = 5.0V
Vin = 3.0V
OUTPUT CURRENT, I
O
(A)
OUTPUT CURRENT, I
O
(A)
Figure 2. Converter Efficiency versus Output Current (Vout =
1.2Vdc).
Figure 5. Converter Efficiency versus Output Current (Vout =
2.5Vdc).
EFFICIENCY, η (%)
70
75
80
85
90
95
012345
Vin = 5.5V
Vin = 5.0V
Vin = 3.0V
EFFICIENCY, η (%)
70
75
80
85
90
95
100
0 1 2 3 4 5
Vin = 5.5V
Vin = 5.0V
Vin = 4.5V
OUTPUT CURRENT, I
O
(A)
OUTPUT CURRENT, I
O
(A)
Figure3. Converter Efficiency versus Output Current (Vout =
1.5Vdc).
Figure 6. Converter Efficiency versus Output Current (Vout =
3.3Vdc).
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 7
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM SMT modules at 25ºC.
EFFICIENCY, η (%)
70
75
80
85
90
95
100
012345
Vin=5.8V
Vin=5.5V
Vin=5.0V
OUTPUT CURRENT, I
O
(A)
Figure 7. Converter Efficiency versus Output Current (Vout =
4.0Vdc).
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 8
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MicroLynxTM SMT modules at 25ºC.
INPUT CURRENT, IIN (A)
0
1
2
3
4
5
6
0.5 1.5 2.5 3.5 4.5 5.5
Io=0A
Io=5A
Io=2.5A
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
INPUT VOLTAGE, VIN (V)
TIME, t (5 µs/div)
Figure 8. Input voltage vs. Input Current
(Vout = 2.5Vdc).
Figure 11. Transient Response to Dynamic Load Change from
50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
TIME, t (2µs/div)
TIME, t (5 µs/div)
Figure 9. Typical Output Ripple and Noise
(Vin = 5.0V dc, Vo = 0.75 Vdc, Io=5A).
Figure 12. Transient Response to Dynamic Load Change from
100% to 50% of full load (Vo = 3.3 Vdc).
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (50mV/div)
TIME, t (2µs/div)
TIME, t (10µs/div)
Figure 10. Typical Output Ripple and Noise
(Vin = 5.0V dc, Vo = 3.3 Vdc, Io=5A).
Figure 13. Transient Response to Dynamic Load Change from
50% to 100% of full load (Vo = 5.0 Vdc, Cext = 2x150 μF
Polymer Capacitors).
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 9
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MicroLynxTM SMT modules at 25ºC.
OUTPUT CURRENT, OUTPUTVOLTAGE IO
(A) (2A/div) VO (V) (50mV/div)
OUTPUT VOLTAGE, INPUT VOLTAGE
Vo (V) (1V/div) VIN (V) (2V/div)
TIME, t (10µs/div)
TIME, t (2 ms/div)
Figure 14. Transient Response to Dynamic Load Change
from 100% of 50% full load (Vo = 5.0 Vdc, Cext = 2x150 μF
Polymer Capacitors).
Figure 17. Typical Start-Up with application of Vin
(Vin = 5.0Vdc, Vo = 3.3Vdc, Io = 5A).
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
TIME, t (2 ms/div)
TIME, t (2 ms/div)
Figure 15. Typical Start-Up Using Remote On/Off (Vin =
5.0Vdc, Vo = 3.3Vdc, Io = 5.0A).
Figure 18. Typical Start-Up Using Remote On/Off with Prebias
(Vin = 3.3Vdc, Vo = 1.8Vdc, Io = 1.0A, Vbias =1.0Vdc).
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
OUTPUT CURRENT,
IO (A) (5A/div)
TIME, t (2 ms/div)
TIME, t (5ms/div)
Figure 16. Typical Start-Up Using Remote On/Off with Low-
ESR external capacitors (7x150uF Polymer) (Vin = 5.0Vdc, Vo
= 3.3Vdc, Io = 5.0A, Co = 1050
µ
F).
Figure 19. Output short circuit Current (Vin = 5.0Vdc, Vo =
0.75Vdc).
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 10
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin MicroLynxTM SMT modules.
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
0.5m/s (100 LFM)
NC
1.0m/s (200 LFM)
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
AMBIENT TEMPERATURE, T
A
O
C
AMBIENT TEMPERATURE, T
A
O
C
Figure 20. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 5.0, Vo=3.3Vdc).
Figure 23. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 3.3dc, Vo=0.75 Vdc).
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
AMBIENT TEMPERATURE, T
A
O
C
Figure 21. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 5.0Vdc, Vo=0.75 Vdc).
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
AMBIENT TEMPERATURE, TA
O
C
Figure 22. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 3.3Vdc, Vo=2.5 Vdc).
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 11
Test Configurations
TO OSCILLOSCOPE
CURRENT PROBE
LTEST
1μH
BATTERY
C
S
1000μF
Electrolytic
E.S.R.<0.1Ω
@ 20°C 100kHz
2x100μF
Tantalum
V
IN
(+)
COM
NOTE: Measure input ref l ect ed ripple current with a sim ulated
source inductance (LTEST) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
C
IN
Figure 24. Input Reflected Ripple Current Test Setup.
NOTE: All voltage measurem ents to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
V
O
(+)
COM
1uF
.
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 25. Output Ripple and Noise Test Setup.
V
O
COM
V
IN
(+)
COM
R
LOAD
R
contact
R
distribution
R
contact
R
distribution
R
contact
R
contact
R
distribution
R
distribution
V
IN
V
O
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvi n c onnec ti ons are r equ ir ed at th e m odu le termin als
to avoi d m eas urem en t errors du e to s ock et c ont act
resistance.
Figure 26. Output Voltage and Efficiency Test Setup.
η
=
V
O
.
I
O
V
IN
.
I
IN
x
100
%
Efficiency
Design Considerations
Input Filtering
The Austin MicroLynxTM SMT module should be connected to a
low-impedance source. A highly inductive source can affect
the stability of the module. An input capacitance must be
placed directly adjacent to the input pin of the module, to
minimize input ripple voltage and ensure module stability.
To minimize input voltage ripple, low-ESR polymer and ceramic
capacitors are recommended at the input of the module.
Figure 27 shows the input ripple voltage (mVp-p) for various
outputs with 1x150 µF polymer capacitors (Panasonic p/n:
EEFUE0J151R, Sanyo p/n: 6TPE150M) in parallel with 1 x 47 µF
ceramic capacitor (Panasonic p/n: ECJ-5YB0J476M, Taiyo-
Yuden p/n: CEJMK432BJ476MMT) at full load. Figure 28 shows
the input ripple with 2x150 µF polymer capacitors in parallel
with 2 x 47 µF ceramic capacitor at full load.
Input Ripple Voltage (mVp-p)
0
20
40
60
80
100
120
01 2 3 4
Vin = 3.3V
Vin = 5.0V
Output Voltage (Vdc)
Figure 27. Input ripple voltage for various output with 1x150
µF polymer and 1x47 µF ceramic capacitors at the input (full
load).
Input Ripple Voltage (mVp-p)
0
20
40
60
80
100
120
01234
Vin = 3.3V
Vin = 5.0V
Output Voltage (Vdc)
Figure 28. Input ripple voltage for various output with 2x150
µF polymer and 2x47 µF ceramic capacitors at the input (full
load).
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 12
Design Considerations (continued)
Output Filtering
The Austin MicroLynxTM SMT module is designed for low output
ripple voltage and will meet the maximum output ripple
specification with 1 µF ceramic and 10 µF tantalum capacitors
at the output of the module. However, additional output
filtering may be required by the system designer for a number
of reasons. First, there may be a need to further reduce the
output ripple and noise of the module. Second, the dynamic
response characteristics may need to be customized to a
particular load step change.
To reduce the output ripple and improve the dynamic response
to a step load change, additional capacitance at the output can
be used. Low ESR polymer and ceramic capacitors are
recommended to improve the dynamic response of the module.
For stable operation of the module, limit the capacitance to less
than the maximum output capacitance as specified in the
electrical specification table.
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards, i.e., UL
60950-1, CSA C22.2 No. 60950-1-03, and VDE 0850:2001-12
(EN60950-1) Licensed.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the input must
meet SELV requirements. The power module has extra-low
voltage (ELV) outputs when all inputs are ELV.
The input to these units is to be provided with a fast-acting
fuse with a maximum rating of 6A in the positive input lead.
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 13
Feature Description
Remote On/Off
The Austin MicroLynxTM SMT power modules feature an On/Off
pin for remote On/Off operation of the module. If not using the
remote On/Off pin, leave the pin open (module will be On). The
On/Off pin signal (Von/Off) is referenced to ground. To switch
the module on and off using remote On/Off, connect an open
collector pnp transistor between the On/Off pin and the VIN pin
(See Figure 29).
When the transistor Q1 is in the OFF state, the power module is
ON (Logic Low on the On/Off of the module) and the maximum
Von/off of the module is 0.4 V. The maximum allowable leakage
current of the transistor when Von/off = 0.4V and VIN = VIN,max is
10μA. During a logic-high when the transistor is in the active
state, the power module is OFF. During this state VOn/Off = 2.5V
to 5.8V and the maximum IOn/Off = 1mA.
V
IN
(+)
GND
Enable
20k
14k
On/Off
Pin
Css
I
On/Off
Q1
Lynx-Series Module
Figure 29. Remote On/Off Implementation.
Remote On/Off can also be implemented using open-collector
logic devices with an external pull-up resistor. Figure 30 shows
the circuit configuration using this approach. Pull-up resistor
Rpull-up, for the configuration should be 5k (+/- 5%) for proper
operation of module over the entire temperature range.
Q1
R1
R2
Q2 CSS
GND
PW M Enable
ON/OFF
VIN+
ON/OFF
_
+
V
I
MODULE
pull-up
R
ON/OFF
Figure 30. Remote On/Off Implementation using logic-level
devices and an external pull-up resistor.
Overcurrent Protection
To provide protection in a fault (output overload) condition, the
unit is equipped with internal current-limiting circuitry and can
endure current limiting continuously. At the point of
current-limit inception, the unit enters hiccup mode. The unit
operates normally once the output current is brought back into
its specified range. The typical average output current during
hiccup is 2A.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout limit,
module operation is disabled. The module will begin to operate
at an input voltage above the undervoltage lockout turn-on
threshold.
Overtemperature Protection
To provide over temperature protection in a fault condition, the
unit relies upon the thermal protection feature of the controller
IC. The unit will shutdown if the thermal reference point Tref,
exceeds 150oC (typical), but the thermal shutdown is not
intended as a guarantee that the unit will survive temperatures
beyond its rating. The module will automatically restart after it
cools down.
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 14
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin MicroLynxTM SMT can be
programmed to any voltage from 0.75 Vdc to 4.0 Vdc by
connecting a single resistor (shown as Rtrim in Figure 31)
between the TRIM and GND pins of the module. Without an
external resistor between TRIM pin and the ground, the output
voltage of the module is 0.75 Vdc. To calculate the value of the
resistor Rtrim for a particular output voltage Vo, use the
following equation:
Ω
−
−
=5110
7525.0
21070
Vo
Rtrim
For example, to program the output voltage of the Austin
MicroLynxTM module to 1.8 Vdc, Rtrim is calculated is follows:
−
−
=5110
7525.08.1
21070
Rtrim
Ω
=kRtrim 004.15
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Vout
Figure 31. Circuit configuration for programming output
voltage using an external resistor.
The Austin MicroLynxTM can also be programmed by applying a
voltage between the TRIM and the GND pins (Figure 32). The
following equation can be used to determine the value of Vtrim
needed to obtain a desired output voltage Vo:
{ }( )
7525.01698.07.0 −×−= VoVtrim
For example, to program the output voltage of a MicroLynxTM
module to 3.3 Vdc, Vtrim is calculated as follows:
{ }
)7525.03
.31698
.07.0( −
×−=Vtrim
VVtrim 2670.0=
V
O
(+)
TRIM
GND
V
t
rim
LOAD
V
IN
(+)
ON/OFF
+
-
Figure 32. Circuit Configuration for programming Output
voltage using external voltage source.
Table 1 provides Rtrim values required for some common
output voltages, while Table 2 provides values of the external
voltage source, Vtrim for the same common output voltages.
Table 1
V
O, set
(V)
Rtrim (KΩ)
0.7525
Open
1.2
41.973
1.5
23.077
1.8
15.004
2.5
6.947
3.3
3.160
Table 2
V
O, set
(V)
Vtrim (V)
0.7525
Open
1.2
0.6240
1.5
0.5731
1.8
0.5221
2.5
0.4033
3.3
0.2674
By using a 1% tolerance trim resistor, set point tolerance of
±2% is achieved as specified in the electrical specification. The
POL Programming Tool, available at www.gecriticalpower.com
under the Design Tools section, helps determine the required
external trim resistor needed for a specific output voltage.
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 15
Feature Description (continued)
Voltage Margining
Output voltage margining can be implemented in the Austin
MicroLynxTM modules by connecting a resistor, Rmargin-up, from
the Trim pin to the ground pin for margining-up the output
voltage and by connecting a resistor, Rmargin-down, from the Trim
pin to the Output pin for margining-down. Figure 31 shows the
circuit configuration for output voltage margining. The POL
Programming Tool, available at www.gecriticalpower.com
under the Design Tools section, also calculates the values of
Rmargin-up and Rmargin-down for a specific output voltage and %
margin. Please consult your local GE technical representative
for additional details.
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 33. Circuit Configuration for margining Output
voltage.
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 16
Thermal Considerations
Power modules operate in a variety of thermal environments;
however, sufficient cooling should always be provided to help
ensure reliable operation.
Considerations include ambient temperature, airflow, module
power dissipation, and the need for increased reliability. A
reduction in the operating temperature of the module will result
in an increase in reliability. The thermal data presented here is
based on physical measurements taken in a wind tunnel. Note
that the airflow is parallel to the long axis of the module as
shown in figure 34. The test set-up is shown in figure 35. The
derating data applies to airflow in either direction of the
module’s long axis.
Figure 34. Tref Temperature measurement location.
The thermal reference point, Tref used in the specifications is
shown in Figure 34. For reliable operation this temperature
should not exceed 115oC.
Figure 35. Thermal Test Set-up.
Heat Transfer via Convection
Increased airflow over the module enhances the heat transfer
via convection. Thermal derating curves showing the
maximum output current that can be delivered at different
local ambient temperatures (TA) for airflow conditions ranging
from natural convection and up to 1m/s (200 ft./min) are
shown in the Characteristics Curves section.
The output power of the module should not exceed the rated
power of the module (Vo,set x Io,max).
Please refer to the Application Note “Thermal Characterization
Process For Open-Frame Board-Mounted Power Modules” for a
detailed discussion of thermal aspects including maximum
device temperatures.
Air
flow
x
Power Module
Wind Tunnel
PWBs
5.97_
(0.235)
76.2_
(3.0)
Probe Loca tion
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 17
Mechanical Outline
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 18
Recommended Pad Layout
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 19
Packaging Details
The Austin MicroLynxTM SMT version is supplied in tape & reel as standard. Modules are shipped in quantities of 500 modules per
reel.
All Dimensions are in millimeters and (in inches).
Reel Dimensions:
Outside Dimensions: 330.2 mm (13.00)
Inside Dimensions: 177.8 mm (7.00”)
Tape Width: 44.00 mm (1.732”)
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 20
Surface Mount Information
Pick and Place
The Austin MicroLynxTM SMT modules use an open frame
construction and are designed for a fully automated
assembly process. The modules are fitted with a label
designed to provide a large surface area for pick and place
operations. The label meets all the requirements for surface
mount processing, as well as safety standards, and is able to
withstand reflow temperatures of up to 300oC. The label also
carries product information such as product code, serial
number and the location of manufacture.
All dimen sions are in millimeters and (inches).
Figure 36. Pick and Place Location.
Nozzle Recommendations
The module weight has been kept to a minimum by using
open frame construction. Even so, these modules have a
relatively large mass when compared to conventional SMT
components. Variables such as nozzle size, tip style, vacuum
pressure and placement speed should be considered to
optimize this process. The minimum recommended nozzle
diameter for reliable operation is 6mm. The maximum nozzle
outer diameter, which will safely fit within the allowable
component spacing, is 9 mm.
Oblong or oval nozzles up to 11 x 9 mm may also be used
within the space available.
Reflow Soldering Information
The Austin MicroLynxTM SMT power modules are large mass,
low thermal resistance devices and typically heat up slower
than other SMT components. It is recommended that the
customer review data sheets in order to customize the
solder reflow profile for each application board assembly.
The following instructions must be observed when soldering
these units. Failure to observe these instructions may result
in the failure of or cause damage to the modules, and can
adversely affect long-term reliability.
Typically, the eutectic solder melts at 183oC, wets the land,
and subsequently wicks the device connection. Sufficient
time must be allowed to fuse the plating on the connection
to ensure a reliable solder joint. There are several types of
SMT reflow technologies currently used in the industry.
These surface mount power modules can be reliably
soldered using natural forced convection, IR (radiant
infrared), or a combination of convection/IR. For reliable
soldering the solder reflow profile should be established by
accurately measuring the modules pin temperatures.
Figure 37. Reflow Profile.
An example of a reflow profile (using 63/37 solder) for the
Austin MicroLynxTM SMT power module is :
• Pre-heating zone: room temperature to 183oC (2.0 to
4.0 minutes maximum)
• Initial ramp rate < 2.5oC per second
• Soaking Zone: 155 oC to 183 oC – 60 to 90 seconds
typical (2.0 minutes maximum)
• Reflow zone ramp rate:1.3oC to 1.6oC per second
• Reflow zone: 210oC to 235oC peak temperature – 30 to
60 seconds (90 seconds maximum
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 21
Surface Mount Information (continued)
Lead Free Soldering
The –Z version Austin MicroLynx SMT modules are lead-free
(Pb-free) and RoHS compliant and are both forward and
backward compatible in a Pb-free and a SnPb soldering
process. Failure to observe the instructions below may result
in the failure of or cause damage to the modules and can
adversely affect long-term reliability.
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C
(Moisture/Reflow Sensitivity Classification for Nonhermetic
Solid State Surface Mount Devices) for both Pb-free solder
profiles and MSL classification procedures. This standard
provides a recommended forced-air-convection reflow
profile based on the volume and thickness of the package
(table 4-2). The suggested Pb-free solder paste is
Sn/Ag/Cu (SAC). The recommended linear reflow profile
using Sn/Ag/Cu solder is shown in Fig. 38.
MSL Rating
The Austin MicroLynx SMT modules have a MSL rating of 2a.
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount
packages is detailed in J-STD-033 Rev. A (Handling,
Packing, Shipping and Use of Moisture/Reflow Sensitive
Surface Mount Devices). Moisture barrier bags (MBB) with
desiccant are required for MSL ratings of 2 or greater.
These sealed packages should not be broken until time of
use. Once the original package is broken, the floor life of
the product at conditions of ≤ 30°C and 60% relative
humidity varies according to the MSL rating (see J-STD-
033A). The shelf life for dry packed SMT packages will be a
minimum of 12 months from the bag seal date, when
stored at the following conditions: < 40° C, < 90% relative
humidity.
Post Solder Cleaning and Drying Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The result
of inadequate cleaning and drying can affect both the
reliability of a power module and the testability of the
finished circuit-board assembly. For guidance on
appropriate soldering, cleaning and drying procedures, refer
to Board Mounted Power Modules: Soldering and Cleaning
Application Note (AN04-001).
Per J-STD-020 Rev. C
0
50
100
150
200
250
300
Reflow Time (Seconds)
Ref low Temp (°C)
Heating Zone
1°C/Second
Peak Temp 260°C
* Min. Time Above 235°C
15 Seconds
*Time Above 217°C
60 Seconds
Cooling
Zone
Figure 38. Recommended linear reflow profile using
Sn/Ag/Cu solder.
GE
Data Sheet
Austin MicroLynx
TM
5A: Non-Isolated DC-DC Power Modules
3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current
Contact Us
For more information, call us at
USA/Canada:
+1 877 546 3243, or +1 972 244 9288
Asia-Pacific:
+86.021.54279977*808
Europe, Middle-East and Africa:
+49.89.878067-280
www.gecriticalpower.com
GE Critical Power reserves the right to make changes to the product(s) or information contained herein without notice, and no
liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s)
or information.
September 25, 2015 ©2015 General Electric Company. All International rights reserved. Version 1.39
Ordering Information
Please contact your GE Sales Representative for pricing, availability and optional features.
Table 3. Device Codes
Product codes Input Voltage Output Voltage Output
Current
Efficiency
3.3V @ 5A
Connector
Type Comcode
AXH005A0X-SR 3.0 – 5.8 Vdc 0.75 – 4.0 Vdc 5A 94.0% SMT 108979667
AXH005A0X-SRZ 3.0 – 5.8 Vdc 0.75 – 4.0 Vdc 5A 94.0% SMT 109100518
-Z refers to RoHS-compliant parts